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Subject[PATCH RT 02/20] ARM: at91: pm: find and remap the pmc
4.1.27-rt31-rc1 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Alexandre Belloni <alexandre.belloni@free-electrons.com>

To avoid relying on at91_pmc_read(), find the pmc node and remap it
locally.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
arch/arm/mach-at91/pm.c | 33 +++++++++++++++++++++++++++------
1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 460181caf51e..1aebb2e9b258 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -35,6 +35,8 @@
#include "generic.h"
#include "pm.h"

+static void __iomem *pmc;
+
/*
* FIXME: this is needed to communicate between the pinctrl driver and
* the PM implementation in the machine. Possibly part of the PM
@@ -85,7 +87,7 @@ static int at91_pm_verify_clocks(void)
unsigned long scsr;
int i;

- scsr = at91_pmc_read(AT91_PMC_SCSR);
+ scsr = readl(pmc + AT91_PMC_SCSR);

/* USB must not be using PLLB */
if ((scsr & at91_pm_data.uhp_udp_mask) != 0) {
@@ -99,8 +101,7 @@ static int at91_pm_verify_clocks(void)

if ((scsr & (AT91_PMC_PCK0 << i)) == 0)
continue;
-
- css = at91_pmc_read(AT91_PMC_PCKR(i)) & AT91_PMC_CSS;
+ css = readl(pmc + AT91_PMC_PCKR(i)) & AT91_PMC_CSS;
if (css != AT91_PMC_CSS_SLOW) {
pr_err("AT91: PM - Suspend-to-RAM with PCK%d src %d\n", i, css);
return 0;
@@ -143,8 +144,8 @@ static void at91_pm_suspend(suspend_state_t state)
flush_cache_all();
outer_disable();

- at91_suspend_sram_fn(at91_pmc_base, at91_ramc_base[0],
- at91_ramc_base[1], pm_data);
+ at91_suspend_sram_fn(pmc, at91_ramc_base[0],
+ at91_ramc_base[1], pm_data);

outer_resume();
}
@@ -394,13 +395,33 @@ static void __init at91_pm_sram_init(void)
&at91_pm_suspend_in_sram, at91_pm_suspend_in_sram_sz);
}

+static const struct of_device_id atmel_pmc_ids[] __initconst = {
+ { .compatible = "atmel,at91rm9200-pmc" },
+ { .compatible = "atmel,at91sam9260-pmc" },
+ { .compatible = "atmel,at91sam9g45-pmc" },
+ { .compatible = "atmel,at91sam9n12-pmc" },
+ { .compatible = "atmel,at91sam9x5-pmc" },
+ { .compatible = "atmel,sama5d3-pmc" },
+ { .compatible = "atmel,sama5d2-pmc" },
+ { /* sentinel */ },
+};
+
static void __init at91_pm_init(void)
{
- at91_pm_sram_init();
+ struct device_node *pmc_np;

if (at91_cpuidle_device.dev.platform_data)
platform_device_register(&at91_cpuidle_device);

+ pmc_np = of_find_matching_node(NULL, atmel_pmc_ids);
+ pmc = of_iomap(pmc_np, 0);
+ if (!pmc) {
+ pr_err("AT91: PM not supported, PMC not found\n");
+ return;
+ }
+
+ at91_pm_sram_init();
+
if (at91_suspend_sram_fn)
suspend_set_ops(&at91_pm_ops);
else
--
2.8.1

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